Transmission-gearing.



CA W. PARKER.

TRANSMISSION GEARING.

APPLICATION FILED SEPT. 22, 1916.

Patented Jan. 2, 1917 4 SHEETS-SHEET l.

mma

w www g w@ uw# QN SQ C.'W. PARKER.

TRNSIVHSSION GEARiNG.

AFPucATxm-a FILED sEPT.22, 191s.

Paented J an. 2, 1917.

4 SHEETS-SHEET Z.

C. W..PARKER.

TRANSMISSION GEARING.

APPLICATION FILED SEPT. 22. 1916.

Patented Jah. 2, N17.

A SHEETS-SHEET 3 (I. Wa PARKER.

TRANSMISSION GEARNG,

APPLICATIGN mio simu, 191e,

4 SHEETS-SHEET fr.

Y a A y ei'ative position.

' obtaining av plurality CLARK W. PARKER,

i COMPANY, OF DETROIT, MICHIGAN,

:1T nl OF DETROIT, MICHIGAN, ASSIGNOR TO 'CADILLAC MTDR CAR AVCORPOBATIDN OF MICHIGAN.

TRANSMIssIoN-GEAMNG.

- which the following is a specification.

to transmission speed-change 'lhis invention relates gearing. and particulady to and shitting mechanisms especially adapted therefor.

One ot' the salient objects ot this invention is to provide satisfactory and etticient means for yieldinely shitting clutching devices ot' a speed-change mechanism into op- .\nother object ot' this invention is to provide improved means toi' yieldingl" bringing into driving relation speed-chant: clutchingl devices, and tor positively disengag'ing such devices.

Another salient object is tol provide a lear box having alined driving and driven shatts. a parallel countershatt, means t'or ot indirect drives and a direct drive between the driving and driven shafts. all ot' the gears beingin constant meshl with improved means toi' yieldingly bringing gears into driving); relation with their respective shafts.

Another salient object is to provide a transmission mechanism with a shittable carrier havingy a shitting tork niouuted tor relative movement thereon. with resilient means tor limiting the movement o 'i' the t'ork relative to the carrier. Connections are also provided between the carrier ain a shitting means tor the carrier`r with lockinn` devices tor vieldingly maintaining the shittingmeans in ditterent positions.4

Another object ot this invention is to provide iii a transmission mechanism a control therefor, comprising a shitting!` lever, a

shittable carrier. a tork mounted t'or relative movement on the carrier, resilient means tor limiting` the movement ot' the fork relative to the carrier, with connections between the lever and the carrier. The connections are provided with a yielding locking device t'or n'iaintaining` the lever in ditllerent positions, theI whole arrangement being such that the lever may be shifted and maintained in`position t'or bringing a speedcliange clutch device into operative relation. and it' the complemen- Specication of Letters Patent.

Application filed September 22, 191.

Patented Jaun. 2L, itlia Serial No. 121,698.

tary portions ot the clutching devices are not in proper relation tor a driving connection the resilient means between the fork and the carrier will vieldingly bring these portions together for a driving connection when conditions are proper for such a connection.

These and other objects will appear troni the tollowing description taken in connection with the illustrative drawings which torni' a part ot' this specification, and in which:

Figurey l is a longitudinal vertical sectional viewyot a preferred torni ot transniission mechanism equipped with a shitting' device embodying my invention, silbstantially on the line l-l ot' Fig. f2.; Fig. 2 is a horizontal sectional view.y with portions broken away, substantially on the line 2--2 of Fig. l; Fin'. 2% is a horizontalsectional view' substantially on the line B-ZaotiFig l: Fig'. l is a transverse sectional view substantially on the line l-l ot' Fig. Qq; Fig. is a transverse sectional view substantially on the line -i ot Fig. L); Fig. (S illustrates an assembly. with portions broken awa. ot' a shitting iorh carrier: Figs. T and S are detail views ot' clutch members; Fig. i) is a longitudinal sectional view through the cani shatt substantially on the line. H9 o Fig. -lz and Fig. ll) is a longitudinal sec.d tional view through-the cani shatt substantiallyl on thc line 101i() oi Fig. l.

lieten-ine to the drawings. l() represents a transmission casingy provided with end walls il and l2. and upper and lower Walls lli and i4.

dii-ranged in the casing' itl. which will he described more fully hereinatt-er. are alined shatts l5 and lli and a parallel conntershatt l?, 'The driving siiatt l5 is adapted to he connected to a prime inover(not shown)#throiigrh the iisual clutch mechanism which may be arranged at the toi-ward end ot' the driving shaft as at 2l. Arranged in a recess toi-ined in the rear end otI the driving shat't l5 is an anti-friction bearing' 2li in which may he mounted the forward contracted end, 27 o't'V the driven shat't itl. rl`he reni ends ot this slia'tt has fitted thereon an anti-friction bearing` which mounted iii the detachable end wall l2 ot the casing and secured in position by means ot' the cap Z9 and bolts 30. rThe coiintershatt l? arranged in a manner lli) below the alined 31 and The a cap 33 suitably -ivall 11; andthe bearing 32 is suitably mounted in the rear end wall 12. Another cap member 3l is suitably secured tothe rear end wall 12 over the rear end of the countershaft, lt will be noted that, adjustably mounted in the cap members 33 and 34, respectively, are buttons for resisting any end thrust of the countershaft. The counter-shaft 17 may have, suitably secured thereto, as by keys 36, a plurality of gears, 38, 39, 40 and al1, respectively, of different diameters.` The alined shafts 15 and 16 have, loosely arranged thereon, a plurality of gears, l2, 43, and 44, adapted to constantly mesh with the gears and 40 on the countershaft. Another Agear 45 may be loosely mounted on the driven shaft 16 and adapted to connect with the gear Ll1 on the countershaft, through an gear 41 on the counter-shaft, through an idler gear @t6 suitably arranged in the casing. A relative rotation on the driving shaft 15 through splines 4.8. This` clutch member is provided with teeth 49 which are adapted to be connected with the teeth 50 on lthe gear 42 by sliding the clutch member 47 forwardly on its splines 48. The gears 44 and 45 on. the driven shaft 16 are provided, on their adjacent sides, with beveled or baclred-of-.faced teeth 51 and 52, respectively. lntermediate the oppositely' disposed teeth 5.1 and 52'is a double clutch member 53. This clutch member, while secured against rotation by splines 54 on the shaft 16, may `be shifted axially thereon. rl`his clutch member notches 55 which are nected with either of clutch members 51 and 52 by a forward or rearward' movement of the clutch member 53, thereby connecting either of these gears with the driven shaft 16. The rear end of the driving shaft 15 andthe forward end4 ofthe gear 13 on the driven shaft 16 are Aprovided `with backed-,off or beveledfaced'clutch teeth 56 and 57, respectively.

adapted to'be conthe complementary Arranged on the shaft 16, intermediate tlie teeth' 56 and 57, member 58v which 16 in the same ber ber is another double clutch is secured to the-shaft manner as the clutch mem- :S3/is secured thereto. The clutch mem- 58 is also formed with notches'59 which are adapted to be connected with either of the complementary clutch membe 's 56 and 57 by a' forward or rearward ovement, respectively, of the clutch member.

Suitablymounted in the opposite end walls 11 and'12 of the casing, and xed against movement therein, are a pair of supporting shafts 60 and ,61. A pair of carriers 62 and 63, having bosses 64C are slidably arranged on the shaft 61. A,sirai- A66, on the carriers 63 is providedv with- V lock `may rest,

lar carrier 65'is slidably mounted on the shaft 60. Shifting forks 66, having bifurcated arms 67, are pivotally mounted as at 68 on each of the carriers, 62, 63 and 65, respectively. The bifurcated arms of the shifting 'fork which is mounted on the carrier 62 are adapted to be arranged in the collar 69 of the clutch member 47 for Shifting same. The arms 67 of the fork 66 which is mounted on .the carrier 63 are adapted to be similarly arranged in the collar 70 of the double clutch member 53, for a similar purpose. The arms 67 of the shifting fork 66 which is mounted on the carrier 65 are adapted to be arranged in the collar 71 of the double clutch member 58. Each of the carriers 63 and 65 is provided with another boss 72. A bolt 73, having a pair of plates 74 and 75 held apartby a spring 76, is, adapted to have one of ,its ends thereon as at 78. Each of the shifting forks and 65 is provided at its upper end with another pair of arms 79 which are adapted to extend between the plates 75 and 77, which permit each shifting fork to swing about distance forwardly and rearwardly. V The forks 66 on the carriers 63 and 65 have` also secured thereon, as by rivets 80, a cam plate 81, the inner face 82 of which is adapted to coperate with depressions or grooves 83 formed in the shafts 60 and 61, respeetively, for a purpose which will be described more fully hereinafter. The carrier 62 is provided with a boss 84 in which may be threaded a studbolt 85. A pair of plates 86 and 87, which are adapted to be held apart by a spring 88, may then be arranged on the bolt. The fork 66 which is mounted on the carrier 62, it will be noted, is also provided with another pair of bifurcated arms 89 adapted to be 86 on the bolt 85 and another plate 90 which may be threaded as at 91 onthe bolt. .v Each of the carriers 63 and 65 is provided with integral upwardly extending arms92 and 93, respectively, having slotted bosseC 94.- in' which may be arranged bolts 95.

lThreaded on these arms 92 and 93 are shiftits pivot 68 a limitedarranged between the plate cal portions 101 and 102. ofthe heads 97 and y 98 are providedwithslots 105 in which a spring-presse plunger 106 for a yielding and slots 107 for apositive lock 108 in which a ball member 109 forming an interlock may 97 and 98 are in neutral position their slots rest. When the heads and selecting iinger 116.

167, and a similar slot, not shown in theV easing 102', are alined. YWhen one of the heads is shifted the ball 10S! is. by its slot 10?, pushed into a position which wili result in the locking of the slot 10T of the other head with the dotted portion of the easing 102. and vice versa.

The ioeir easing 102 is provided in its upper portion with a iongitudinally extending groove 110 for a purpose whieh will be described more fnliy hereinafter.

'.lihei iedestal support and cover member 103, which is adapted to eover the opening 111 in the upper Wall 1i of the easing 10, is adapted to be secured in position as by boite 112.

' cam shaft 113 magyY slidably arranged in oppositei;Y disposed bearing members 111 mounted in bosses 1.1:,` in the cover member 1112i. The cam shaft. 113 may have formed thereon or seeured thereto a socket portion 11o and downwardly extending shifting Also seen to the shaft 113 or formed integral therewith are oams 117 and 118 having'a plurality of sets of cam contours 119-119' and 120-120, respectively. A cam foliewer 121, having a main arm 122 and transverse arms 123,'may be pivotally mounted as at l24f'in the cover member 103. The opposite ends of the transverse arms 123 of the Cam foilower 121 may ne aetnated by the Cam; 117 and 11.8 as

will be deserihed more fullyliereinafter.

The main arm 122 of the earn foiiower 121 1s bifnreated at 126 to embrace. the npwardltr extending are? 127 of the carrier for aetil-ating the same.

Sleeved on the Cam. shait 1 member 128. having a depenti slidably guided by grooves 110 formed in easing 102. The rocking member 128 is provided with a. 7lateral groove 130g and is maintained against airiai movement on the shaft. 113 between the cam 11? and the pin 128".

A shaft 131 having arms 132 and 133, respectively, may oe mounted the oever member 103. The arm 132 i dapted to be 3 is a. ioeiing s a connected through iiniragi 3 with the aetnating mechanism for the eiatei- 24- between the driving shaft sind the motor (not showni. The other arm 13-'5 is provided with'a snee 135 ich is adapted to he located in the groove 130 of the ieoliing member the clutch memijer 2i is in s preventing an the Aeine Eheft 113 im@ nearer.

136 comp es a hail 13T from which an arm '138 and a The pedestai niemmember haii memher 1253i) extend. oer 11E an inwardly extending it 1+i@ in which may be mounted semilspherical socket member 1411 serving as a support for fore7 as the ing shaft a felt washer 142 having a spherical surface 143 and a nut l-lJf threaded in position in the pedestal member 103 serves to hold the lever in position the. ball member 137;;

while permitting the arm 138 to be swungr in ing lever will be tilted laterally to the right,

revolving the cam shaft li in a rlocliwise direction, looking forwardl)v thereof7 thereby moving the selecting and shifting linger 116,130 the left into the slotted portion 10() of the shifting head 9H. lYith the shifting lever thus tilted. the lower end ma)v be moved forwardly. also sliding'the carrier (33 its shifting fork (So. and the double Clutch member 523 to which it is connected. in the same direction. if the teeth 51 on the low-speed gear 4-1 are not in absolute alinement for engagement with the teeth 55 in the eiuteh member 53, the resistance encountered between shifting fork (it) and its carrier (33 will cause a compression ofthe spring 7o and a swinging movement of the fork on its pivot (3S. However, when ronditions are proper for a full meshing of the teeth 5l and expansion of the spring TG will canse the shifting fork to return to a substantially vertieal position. Yi'hen the lower end 138 of the lere: is tilted to the right for selecting thtl loweipeed clutching devicei the cani contour 11.)119 is pre4 sented to the ends 125 of the eam follower 121. .in neutral position. with the cam so turned, the rear end 125 of the eaui follower will vabut against, the highest point of the cam contour 119, and the forward endl25 of the cam foliower will be located in the lowest part of the cam contour 119. Thereeani Shaft 113, with its actuating nger 11G, is shifted forw'ardly. the forL ward end of the cam follower will be moved Aoutwardly by the rising surface of the cam 118 and the rear end of the cani follower will more inwardly on the receding surface of the cam 117, thereby causing a rockingf movement of the cani follower about its pivot 124iand a forward movement of the earl-ier G2' end the eiuteh member 4T connected therewith, thus connecting the driv- 15 with the gear 42 loosely mounted thereon. lWith this arrangement of clutches, ri drive vis given from the shaft through the gears 42, 3 8, 40 and 4J; tothe driven shaft 16. shifted. the main eluteh eonnecting the motor with the driving shaft may be engaged. 1f it is now desired to go into intermediate After the parts are thus speed, the main clutch will be disengaged and the lower end 1238 of the shifting lever may then be moved rearwardly to its original position. It will he noted that as the carrier 63 is shifted forward the rear por tion of the face S2 of the cam nl secured to the upper part of the shifting fork 6G will descend into the depression-or groove S3 formed in the stationary shaft (31 on which the carrier (33 is mounted. Therefore, when the carrier (Si) isshifted rearwardly for disengagiiig the clutch member 53 from the teeth 5l the rear end of the lain face 82 is caused to move outwardly, it' it happens to be tilted, until it is in a substantially ver-tical position, thus insuring the positive withdrawal of the clutch from the engaging position while 'permitting of a yielding engagement of the clutchv and its complementary parts. Of course itwill be understood that as the clutching element 53 is brought back to neutral thev clutching member 147 is also brought back into neutral by an action of the cams 117 and 118, which is the reverse of that described. The lower end 138 of the lever may now be tilted to the left, causingv an oscillation of the cani shaft 113 and a tilting of the selecting finger 11G to the right into the slotted portion 99 of the shifting head 97. "lhe'cam shaft 113 may then be shifted rearwardly, causing the carrier (35, its shifting fork (i6, and its connected clutch member 58 to move iii the same direction until the teeth 57 are struck by the teeth 59 in the clutch member.

It will be understood that as the finger 116 is'roclied to the right the cani contour 1.20-- 120 is presented for actuating the cam follower 121. lVith such a rocking movement, before the cam shaft 113 is shifted reai'- wardly the rear end 125 of the cam follower will be adjacent the. point where the outer straight surface of the cam 11T meets the receding portion of the cam, and the forward end 125 of the cam follower will be adjacent arpoiiit where the straight surface ofthe cam 11S meets the rising portion of the cam. lherefore1 as cani shaft 113 is .moved rearwardlythe cams 117 and 118 will cause the forward end 125 of the cam follower to ride outwardly on the'cam contour 120 -and the rearward end 125 to ride in wardly on the cam contour 120. This will. :anse a forward rocking movement of the niaiii arm 122'of the cani follower', to shift the carrier (32 and the clutch member L17 to again engage with the gear 42. If, as the clutch element 58 is brought against the complementary teeth 57 on the gear 43, the shaft 16 on which the element is mounted is revolving at a greater speed than the gear 5, there will be no engagement of theteeth 57 with the teeth V9 until the shaft 1G decreases in speed to or below that of the gear 43, the reason being that the beveled teeth 57 are so liackectotf' that they will slide by the teeth 59 in the clutch member in one direction. rlhis, of course7 will cause a compression of the spring 7G on the carrier G5, with the tilting of its shifting fork 6G. Gf course, when the parts are in proper relation for clutching engagement, the expanding action of the spring with the shifting iever in in'edeterniined position will cause a y' l' engagement of the clutch 58 and the g i .it is also understood that as the cari ci shifts the clutch member t? a i gagemeut permitted and a. posi gageinent isalso provided.

The shifting carrier is provided with means similar to that on the carrier 533,

which gives a positive disengagement of the clutching member in either direction. lVith the clutch .member 58 in driving connection with the gear 43, the drive through the transmission is vfrom the drivingshaft 15 through the gears 42, 32B, and 43 to the driven shaft 16. If it is now desired te directly connect the driving` and driven shafts, the Cain shaft willbe moved forwardly, bringing the clutch elements 5h and 417 into neutral position. and 'with t lower end 139 of the shifting lever still Filted toward the left the main clutch will' be dise. gaged and the shifting lever nioved. foiwardly, still carrying the carrier G5 and the clutching element in the saine direction. lf the clutch teeth 56 on the driving shaft are not in proper relation to the teeth 59 on greater speed than the driven shaft, when there will be a yielding engagement connecting the driving anddriven shafts directly.

It will be understood that when the cam shaft 113 is moved forwardly for directly driving the driven shaft, the cam follower 121 will not be rocked from its neutral position on account of the fact that the forward and rear ends thereof will rid/e on the parallel faces of the. cam contour 12th-120.

It will be noted that with a direct drive between the driving and driven shafts there. is no driving connectionbetween either the.

driving or driven shaft and the countershaft; therefore the countersliaft is idle 0n direct drive.

After shifting the cam shaft realli;

wardly, disengaging the direct driving connection, a reverse drive may be ,obtained by tilting the lower end 138 ofthe shifting le- Alug 129 formed on the y forward speed.

ver to the right, moving the selecting finger 116 to the left, as for low-speed Connection. and moving the carrier (33 and its connected clutch member 5?) rearwardly, thus eonneeting the teeth on the gear 45 with the clutch member 53%. Of course. if the eluteh parts are not in ideal relation for a driving connection there will be running engagement as desrribed in connertion with the engagement of the clutch member 53 with the teeth 51. Of course it will be understood that the eam contour 119- 119' will cause an engagement of the. clutch member 4T with the gear 42. verse drive shift, the connection will be from the lriving shaft 15 through the gears 42, 3S, 41. 46 and 45.

it will be understood that the depending.f Y lookingr member 128 will'slide forwardly1 and rearwardly in the groove 110 formed in the lool; easing 102. and is adapted to prevent rotation of the locking' member 12S. thereby maintaining its groove 130 in proper interloeking relation with the shoe. 135 onthe shaft lill. thereby preventinga shifting' of the 0am shaft 113 when the main eluteh is in engaged position.

Itwill be noted that if. while the shaft 1b is revolving;` for forward speed. the double clutch member 52-5 is thrown rearwardly toward the gear 45 for eonnertineA this gear to.

the Shaft 16 for reverse` and the `:rear #i5 is going in the opposite direetion to the eluteh member 53. the shifting; iinwli=niism for the eluteh member 53. ineludin; v its spring. will eoiiperate with the baelv'ed-ofi" teeth 52 on the gear 45 to form an overrunning elnt'eh meehanism until the parts are in proper relation for a reverse driving' eonneetion'. also, if the double eluteh member 5?) is thrown for a under the same eireumstances. the eluteh meehanism will operate similarly.

VlThile have deseribed and illustrated what l believe to be a preferred embodiment of my. invention, it will be understood by those skilled in the cations and Changes may be made without departing from the spirit and seope hereof.

Having thus described my invention.what Claim and desire to secure b vy Letters Patent is:

1. In a transmission meehanism. the combination with a carrier member. of a shifting fork mounted for relative movement thereon, resilient means between said earrier and said fork` and' means for shift-ingr said ea rrier.

Q, lira transmission meehanism.v the combination with a shiftable carrier. of a shifting fork pivotall)7 mounted thereon. a resilient connection between said fork and earrier, and means for shiftingr said carrier.

3. In a device of the class deseribed. the

yielding or over i With the re-v art that various modifi-A eombination with a shaft, and a. Slidable earrier mounted thereon, of a shifting fork pivotally mounted on saidcarrier. a resilient eonneetion between said fork and said earrier. and means between said shaft and said carrier for positively moving said fork about its pivot with a relative sliding movement between said shaft and earrier.

t. ln a device of the elass described, the eombination with a shaft. and a slidable earrier mounted thereon. of a shifting:- fork pivotally mounted on said earrier. a resilient eonneetion between said fork and said earrier. and eam means between said shaft and said earrier for positively moving' said fork about its pivot with a relative slidingr movement between saidshaft and arrieix In a tra1ismissiouaiiet'hanism, the combination with a shii'tablenearrier. of a shiftingr fork pivotally mounted thereon. a eam on said fork. and a shaft for said earrier, said shaft being;- provided with a groove eooperatinga' with said ram. as and for the purpose deseribed. f.

t3. ln a deviee of the' elass deseribed, the rombination with a .slmfthavine a longitudinal `groove formed therein. and a slidable carrier mounted thereon. a fork pivotally mounted on said carrier. a eam on said fork. and a resilient eonneetion between said fork and said earrier.

i. in a deviee of the class deseribed. the eombination with a shiftable carrier, vi shifting forh pivotall'v mounted thereoii' sprin; y means between one end of said fork and said earl-ier for limiting; they swinging' movement of said fork thereon. a stationary support for said rarrier. and means between said support and said end of said fork for positively moving.r said fork about its pivot in one direetion while permitting a free movement of said fork in another direction.

ts'. ln a device of the elass deseribed, the eombination with a stationary shaft provided with an inelined 2groove therein. of a slidable earrier mounted thereon. an arm pivotally mounted on said earrier. said arm beiner provided with a eam eoiiperating wit'. said groove, for movingl the arm about its pivot when said carrier is slid on said shaft.

i). ln a deviee of the elass deseribed, the combination with a stationary shaft provided with an inclined groove therein.I of a slidable earrier mounted thereon, an arm pivotally mounted on said rarrier, said arm being provided with a eam eoperat-ing with said groove, for moving! the arm about its pivot when said earrier is slid on said Shaft. and a resilient conneetion between one end of said arm and said carrier. as and for the purpose set forth.

10. ln a transmission mechanism, the oombination with a shaft, mounted thereon, of a shifting fork pivot and a slidable carrier mg movement of said fork is .bination with a ally mounted on said carrier, and means between said carrier and fork whereby a rockpermitted with the movement of said carrier in one direction and said fork is held stationary with a reverse movement of said carrier.

l1. In a transmission mechanism, the comrotatable clutch element which is adapted to be shifted, and a shiftable carrier, of a shifting` fork mounted for `relative movement on said carrier, and resilient means for limiting the relative movement between said fork and carrier. V

l2. ln a transmission mechanism, the combination'with a rotatable clutch element which is adapted to be shifted, and a shiftable carrier, of a ,shifting fork mounted for relative movement on said carrier, and resilient and positive means for limiting the relative -mi'ivement between said fork and carrier.

13. In a transmission mechanism, the combination with a casing, a shaft mounted therein, and a carrier member slidabl)7 mounted on said shaft, of a shifting fork pivotally mounted on said carrier, and a spring device between one end of said fork and said carrier for-cushioning its pivotal movement.

14. In a transmission mechanism, the combination with a casing, a shaft mount ed therein, and a carrier member slidabljyr mounted on said shaft, of a shifting forli pivotally mounted on said carrier, a spring device between one end of said forli and said carrier for cushioning its pivotal movement, and means between said fork and said shaft for positively moving it on its pivot with a shifting movement, in one direction, of the carrier on said shaft.

Vl 5. In a transmission mechanism, the coi'nbinatoin with a. shiftable carrier, of a fork pivotally mounted thereon, resilient means between one end of the fork and the carrier, means for shifting said carrier, and

' combination ed for relative movem a yielding locking device for said shifting 1:6. ln a transmission mechanism, the with a shiftahle carrier, of a fork pivotally mounted thereon, resilient means between one end of the fork and the carrier, means for shiftingsaid carrier, and a. locking device for yieldingly maintaining said shifting means in any of a plurality of positions.

17. In a .device of the class described, the combination with a carrier, of a fork mounted for relative movement thereon, resilient means for limiting said movement, means for shifting said carrier, and a locking device for maintaining said shifting' means in di tferent positions.

1S. In a device of the class' described, the

combination with a carrier, of a fork mount- Ant thereon, means for limiting said movement, leans for shifting` said carrier, and yielding` means for maintaining said shiftingmeans in different positions.

ll). In a device of the class described, the

combination with a carrier, of a forli mounted for relative movement thereon, resilient means between said fork and carrier for lil'nitingv said movement, a shifting lever, connections between said lever and said carrier, and yieldingmeans for ,maintaining said connections in dierent predeterminedl positions.

20. ln a device of the class described, the combination with a carrier, of a fork mounted for relative movement thereon, resilient means between said forli and carrier for limiting said movement, a shifting lever, connections between said lever and said carrier, and yielding means for maintaining said connections and said lever in diilerent predetermined positions.

In testimony whereof i aiiizi CLARK "li/v. l

my signature. 

